From 9bc5ced02a09010b7ed4fd3a62a3d3e0a03665da Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Wed, 4 Aug 2021 20:27:32 +0200
Subject: Add support for writing CPL metadata about sign language video tracks
 (DoM #2062).

---
 src/cpl.cc | 21 +++++++++++++++++++++
 src/cpl.h  |  9 +++++++++
 2 files changed, 30 insertions(+)

(limited to 'src')

diff --git a/src/cpl.cc b/src/cpl.cc
index e52f8b34..1f20d13e 100644
--- a/src/cpl.cc
+++ b/src/cpl.cc
@@ -312,6 +312,23 @@ CPL::read_composition_metadata_asset (cxml::ConstNodePtr node)
 			_additional_subtitle_languages.push_back (sll_split[i]);
 		}
 	}
+
+	auto eml = node->optional_node_child ("ExtensionMetadataList");
+	if (eml) {
+		for (auto i: eml->node_children("ExtensionMetadata")) {
+			auto name = i->optional_string_child("Name");
+			if (name && *name == "Sign Language Video") {
+				auto property_list = i->node_child("PropertyList");
+				for (auto j: property_list->node_children("Property")) {
+					auto name = j->optional_string_child("Name");
+					auto value = j->optional_string_child("Value");
+					if (name && value && *name == "Language Tag") {
+						_sign_language_video_language = *value;
+					}
+				}
+			}
+		}
+	}
 }
 
 
@@ -433,6 +450,10 @@ CPL::maybe_write_composition_metadata_asset (xmlpp::Element* node) const
 	/* SMPTE Bv2.1 8.6.3 */
 	add_extension_metadata ("http://isdcf.com/ns/cplmd/app", "Application", "DCP Constraints Profile", "SMPTE-RDD-52:2020-Bv2.1");
 
+	if (_sign_language_video_language) {
+		add_extension_metadata ("http://isdcf.com/2017/10/SignLanguageVideo", "Sign Language Video", "Language Tag", *_sign_language_video_language);
+	}
+
 	if (_reels.front()->main_sound()) {
 		auto asset = _reels.front()->main_sound()->asset();
 		if (asset) {
diff --git a/src/cpl.h b/src/cpl.h
index 68243765..18b00098 100644
--- a/src/cpl.h
+++ b/src/cpl.h
@@ -307,6 +307,14 @@ public:
 
 	void set_additional_subtitle_languages (std::vector<dcp::LanguageTag> const& lang);
 
+	void set_sign_language_video_language (dcp::LanguageTag lang) {
+		_sign_language_video_language = lang.to_string();
+	}
+
+	boost::optional<std::string> sign_language_video_language () const {
+		return _sign_language_video_language;
+	}
+
 	Standard standard () const {
 		return _standard;
 	}
@@ -355,6 +363,7 @@ private:
 	boost::optional<dcp::Size> _main_picture_active_area;
 	/* See note for _release_territory above */
 	std::vector<std::string> _additional_subtitle_languages;
+	boost::optional<std::string> _sign_language_video_language;
 
 	std::vector<std::shared_ptr<Reel>> _reels;
 
-- 
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